Weird but True story:
Myself and friend were exploring a huge Cave near my home that we had explored many times growing up. One day as were were traveling into this enormous cavern and cave system , we were maybe 5 or 10 minutes deep when we were at a section that is a bit tricky to navigate, two huge slabs of stone , one below and one above both on a 45 degree angle for about 10-15 feet and about 3 feet tall. there is NO bottom when the slab ends, it hangs over a ledge that disappears into darkness, when we would throw stones down, they just kept bouncing, so , one slip and who knows where you would end up, very dangerous and no guide ropes just use your hands and feet.
so anyway we make it across and as we continue on we see a light ahead, it was a lighter actually. There are 3 people already in the cave. sort of grouped together . As we make our way up to them we use our lights and I recognize one of them, he is an old Native American friend I have known since I was young, he was a bit older so I only knew him from seeing him when I was fishing or just around the area , but we were friendly and knew each other by name. He was always out in the woods or by the river. he was most likely a shaman , but at the time, I didn't know or care much for these things.
he was flickering his lighter so we would see them and so we greeted them I asked what they were doing.
He said that he was guiding this man and woman through the cave, they had stopped to smoke ...and that they were on LSD.
Im sure I must have said something like "WOW , thats Cool man , how wild it must be to see all the cave features while tripping , very cool".
He then explained, as the folks sort of just smiled and laughed a bit, that they are also BLIND. they were both Blind and 100's of yards into a Cave while Tripping. WOW.
apparently in the cave , with the echos and the help of the LSD , they could see , or sense the surroundings.
I have to admit we only hung out for a few minutes, I got the sense we were intruding so we left after a few minutes so I did not see what they were doing and I cant know if they were blind from birth or not. at the time I was young, maybe 17 or 18, so it was all very cool and I remember telling many people about it (because how often do you find an Indian and two blind people tripping in a cave?)
- But after reading some of these posts I think I am starting to realize how significant it was for them to experience this space, with a Spiritual guide and the help of LSD , it may have been ( I dont know) the first sense of vision they have known with the aid of the 3rd Eye.
So, maybe not an answer to your question, but a true story that may help get to that answer, at least I have one account where LSD does affect people who are blind in a profound way. I saw it and still find it hard to believe but I swear to you all, It is TRUE.
I will NEVER know how they climbed to that place ~ when two young athletic guys who grew up in those hills had to be very careful to get that deep, It was one to remember.
~Shaman